What are the checks and balances for regulating the use of Exectutive Orders?

From the link.
"So the question we have to deal with is “Is it possible that Barack Obama could sign an executive order to impose gun control?” The answer is, “Yes, it is possible he could sign such an executive order.” The issue though, is whether or not such an executive order would be lawful and upheld by the Congress or the Supreme Court. Congress may pass a law that alters an executive order, and they can be declared unconstitutional and vacated by the Supreme Court."